“Rocky Mountain oysters are the original sack lunch”

“Rocky Mountain oysters are the original sack lunch” is a jocular saying that has been printed on many images. Rocky Mountain “oysters” (also called “calf fries”) are bull testicles.
     
“Rocky Mountain Oysters: The original sack lunch. Classic” was posted on Twitter by Topslakr on April 10, 2009. “Just read a shirt that said Rocky Mtn Oysters, the original sack lunch, I hate southeast missouri” was posted on Twitter by Darius Boyher on March 30, 2010.
 
“Calf fries, the original sack lunch” was posted on Twitter by John Tyler Perry on December 28, 2013. “Calf fries..the original sack lunch” was posted on Twitter by Dane Kachel on July 18, 2014.
   
       
Wikipedia: Rocky Mountain oysters
Rocky Mountain oysters, or mountain oysters, or meat balls, also known as prairie oysters in Canada (French: animelles), is a dish made of bull testicles. The organs are often deep-fried after being skinned, coated in flour, pepper and salt, and sometimes pounded flat. This delicacy is most often served as an appetizer.
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Alternative names  Meat balls, prairie oysters, calf fries, cowboy oysters
             
Twitter
Topslakr
@topslakr
Rocky Mountain Oysters: The original sack lunch. Classic.
11:11 PM · Apr 10, 2009·Twitter Web Client
   
Twitter
Brandon Brady
@6brady9
mountain oysters… the ORIGINAL “sack” lunch!  lol
3:07 PM · Sep 1, 2009·Twitter Web Client
   
Twitter
Darius Boyher
@dariusboyher
Just read a shirt that said Rocky Mtn Oysters, the original sack lunch, I hate southeast missouri
5:15 PM · Mar 30, 2010·Twitter Web Client
   
Twitter
luannschindler
@luannschindler
Rocky mountain oysters: original sack lunch. Ha!!
3:23 PM · Apr 18, 2010·Twitter Web Client
   
Twitter
John Tyler Perry
@tenaciousjt
“Calf fries, the original sack lunch.”
3:15 PM · Dec 28, 2013 from Fort Worth, TX·Twitter for iPhone
 
30 January 2014, CBS This Morning, “When the Seahawks and Broncos take the field on Sunday”:
MO ROCCA: Well, clearly you haven’t tasted Rocky Mountain oysters here at the Buckhorn Exchange. Don’t know what they are? Google them. Let’s just say you need real conies to eat these. Delicious. Love them.
WOMAN: The original sack lunch.
 
7 February 2014, Des Moines (IA) Register, “Kyle Munson’s Iowa: Festival Serves Up a Porcine ‘Treat,’” pg. 16B, col. 1:
They’re called Rocky Mountain oysters. Bull fries. Pork fries. The original sack lunch.
   
Twitter
Dane Kachel
@KachelDane
Calf fries..the original sack lunch
@kmariemorris @alueckemeyer84
1:16 PM · Jul 18, 2014·Twitter for Android
 
Twitter
Villard Ranch
@villardranch
Lamb fries…The original sack lunch! http://fb.me/2PzEZgD9G
7:21 AM · Nov 30, 2014·Facebook
   
Twitter
rowdy robertson
@bigRout
Calf fries the ORIGINAL SACK LUNCH!!!!! #rafterj
9:09 PM · Jun 24, 2015·Twitter for iPhone
 
Google Books
Colorado Excursions with History, Hikes and Hops
By Ed Sealover
Charleston, SC: The History Press
2016
Pg. ?:
Those Rocky Mountain oysters, which coowner Bill Dutton calls the “original sack lunch,” are not just a gimmick; they’re among the bestselling items on an exotic game menu that also features smoked rattlesnake, fried alligator tail and the occasionally available ostrich and yak.
     
ARLnow
Testicle Festival Returning to Virginia Square
ARLnow.com May 26, 2017 at 11:00am
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You’d be NUTS to miss this! The Montana State Society would like to invite you to have a ball (literally!) at the 13th annual D.C. Testy Fest – “The Original Sack Lunch” – to be held from 6:00PM – 11:00PM on Saturday June 3rd, 2017 at the Arlington American Legion.
     
Twitter
Mark Ivy
@k3vsDad
Calf Fries – The Original Sack Lunch – Cowboys of Waggoner Ranch http://citizenjournalistslive.com/2017/12/16/calf-fries-the-original-sack-lunch-cowboys-of-waggoner-ranch/
5:21 PM · Dec 16, 2017·WordPress.com
     
Twitter
Kaeden Chasteen
@chasteen_kaeden
Calf fries: the original sack lunch.
4:17 PM · Apr 22, 2018·Twitter for iPhone
 
Atlas Obscura
July 12, 2018
Rocky Mountain Oysters
Battered and fried testicles make use of a cattle-country surplus.

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Testicle festivals, or “Testy Fests,” featuring Rocky Mountain oysters also abound. With cheeky themes such as “Legends of the Ball,” “The Original Sack Lunch,” and “Nuttin’ Better,” attendees can enjoy all-you-can eat “oysters” or watch testicle-eating competitions.
     
Outdoor Life
How to Cook Venison Rocky Mountain Oysters
Time to get serious about using every part of the animal

By Krissie Mason
Updated: November 7, 2019
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Cowboy culture of the Old West had a similar relationship with “tendergroins”. While culling hundreds of bull calves for castration, the Cookie and the chuckwagon crew commonly prepared calf fries, (Original sack lunch?), to give the cowboys added stamina for long rides.
 
Twitter
Jdawg!
@jdawg3480
Mountain oysters are the original sack lunch.
10:55 PM · Mar 2, 2020·Twitter for iPhone
 
Twitter
chaz graner, trump in 2020. I want my country back
@cchazmo222
Rocky Mountain Oysters…the original “sack” lunch.
11:08 PM · Mar 3, 2020·Twitter Web App